Improvement is cab-wheel



@uitrit ftons jlatnt @frn Letters Patent No. 80,323,1.Zatecl July 28, 1868.

IMPROVEMENT IN GAR-WHEEL.

@te Srlahule reftrrch in in ilgrse tiicrs ntent mit making gaat nf tige sante.

TO ALL WHOM IT MAY CONCERN:

Beit known that I, WILLIAM WILMINGTON, of Toledo, in the county of Lucas, and State of Ohio, have invented a new 'and useful Improvement in the Casting of Car-Wheels; andI do hereby declare that the`fo1- lowing is a full und exact description thereof.

The accompanying drawings representa mould for casting one form of car-wheels. The melted iron is poured into the recess A, in the centre of the upper portion of the mould, whilst the mould I is in a stationary horizontal position. The melted iron ows through the side holes b IJv and'also through the hollow central core d. Apertures at the base of the coro d permit the melted iron to flow outward .into the interior of the mould, and intermingle with the uid metal, which passes into the mould through the holes b la b. But I wish i it to be understood that my improvement in the cast-ing of car-wheels is applicable to every shape and style of cast-iron car-wheels that can he producedby the following-described method of casting such articles.

The following is my improved method of casting car-wheels:

I first pour into the central portion of any properly-prepared and firmly-bedded car-wheel mould `the proper quantity of chill-hardening` melted iron, to form thc rim portion of the wheel, and then kI immediately fill the mould with a melted iron ofa softer'and tougher nature. The last pouring of melted iron into the mould fce'S the first metal pouredinto thesame outwards into the rim of the'whce'l-mould, thereby causing the chillhardening iron'to form thorim oflthe car-wheel, and thesofter and stronger iror to form. the hub and plate or plates ofthe same. 'The forcing outwards of the chill-hardening melted iron first poured into the' mould by the melted softer iron immediately afterwards poured into the same, causes an intermingling of the two at and near their circle of contact, and this perfect union between these two qualities of iron causes the cai'-\vheel thus produced to excel all other cast-iron`wheels in every desirable quality.

In practice, I havo found that the union between the two` qualities of iron-employedin the production of my improved car-wheels is more'perfect when the uiclted softer iron is. poured into the mould at a slightlyperceptible higher temperature than that at which the melted bard iron is pured into `the same. For instance; thc temperature ofthe hard (orvchilbhardening) iron,rat the tim'e of pouring, being indicated by a yellowish red,

th temperature of thc-softer iron should be indicated by a whitish red, distinctions that are well known t0 practical founders. But a goed car-wheel will be produced when both qualities of iron are poured into the mould at about the same temperature.

I am aware that an attelnp'thas been madc to produce a carwh`cel of fhard-and soft iron poured separately.

into a mould whilst in astatc of rotation and slightly inclined, but,'so far as I have been able to ascertain, n0 carwhecl has ever been producedby such a procesa; and from my own practical experience as a founder, I unhesitatngly assert that it would be impossible to produce a perfect castingby said process, and for the-well known reason that the slightest' movement of a sand-mould, when ready for use, will destroy its integrity and crumble it into chaos. How absurd, then, tosuppose that a car-wheclrmould' could successfully endure the centrifugal forcing outwards th'eren of the'fluid metal, in addition 'tothe tremor produced bythe rotation thereof. A i

What I claim as my mverltion, and desire to secure by Letters Patent. as 'a new and improved article of manufacture, is-

The withindescribe'l cast-iron ear-wheel, the said wheel being produced by the use of two qualities f'iron, and by substantially theprocoss herein described.

y wM.' WILMINGTON.

Witnesses:

Z. C. Romance; EDM. F. Bnown. 

